textscan (read data from second and fourth line)

i am having some trouble using textscan

i have data in input file as

AAA BBB CCC DDD

10 20 30 40

EEE FFF

40 50

how to read this data

i can read data if it is only in the first line of input file but having trouble it data is in multiple line

[Walter Roberson]

Do you know the exact number of values on the 2nd and 4th line?

[Haris Hameed]

yes 4 values in second line and 2 in fourth line

line one and line three contains the parameter name

Answer 1

[Walter Roberson]

L2cell = textscan(fid, '%f%f%f%f', 1, 'HeaderLines', 1, 'CollectOutput', 1);
L4cell = textscan(fid, '%f%f', 1, 'HeaderLines', 1, 'CollectOutput', 1);

[Haris Hameed]

fid1=fopen('input3.dat','r');

L2cell = textscan(fid1, '%f %f %f %f', 1, 'HeaderLines', 1, 'CollectOutput', 1)

L4cell = textscan(fid1, '%f %f', 1, 'HeaderLines', 1, 'CollectOutput', 1)

fclose(fid1);

AAA=L2cell{1,1}

BBB=L4cell{1,1}

i get

AAA =

10 20 30 40

BBB =

Empty matrix: 0-by-2

still not getting values for fourth row

[Haris Hameed]

also i want to use these values separately

like i try DDD=L2cell{1,2}

i get ??? Index exceeds matrix dimensions.

Error in ==> check at 12

DDD=L2cell{1,2}

[Thomas]

try

L4cell = textscan(fid, '%f%f', 1, 'HeaderLines', 3, 'CollectOutput', 1);

L4cell{:}

[Thomas]

to get it as separate values use:

p=L2cell{:}

m=L4cell{:}

>> m(1)

ans=

40

[Walter Roberson]

If you want the values in separate cells, leave off the "CollectOutput" option. It would probably be easier to use AAA(1), AAA(2) and so on.

HeaderLines 3 would only apply if you had reset to the beginning of the file.

[Walter Roberson]

Okay, looks like you need to add

fgetl(fid);

between the two textscan() calls, as the cursor is left at the end of the line rather than at the beginning of the next line.

[Thomas]

Walter, you do not need to reset to the beginning of the file at-least not in 2012a. The following works just fine.. Though it might not be the optimal way of doing this.. :)

fid=fopen('input1.dat','r');

L2cell = textscan(fid, '%f%f%f%f', 1, 'HeaderLines', 1);

L4cell = textscan(fid, '%f%f', 1, 'HeaderLines', 3);

L2cell{:}

L4cell{:}

[Daimien Burks]

Don't mean to steal the thread, but would this work on columns as well? Like get AAA/10 and CCC/30?